Maybe you're just being vague, but I don't think that's even possible. I would say the effect is more that that it can innapropriate supplement their understand

Maybe you're just being vague, but I don't think that's even possible. I would say the effect is more that that it can innapropriate supplement their understanding of reality in matters that aren't contradicted by reality -- high-minded concepts that are popular subjects of discussion, but very marginal in day-to-day living seem to often driven by experiences with fiction, and that might be inappropriate. (E.g., People often assume space travel is inevitable or far easier than it is due to fiction.) On the other hand, so many kinds of error can be distilled down to a failure to understand the difference several orders of magnitude make, so I wouldn't blame fiction per se.